Mington



(No Model.) 3 SheetsSheet 1.

O. H. IRWIN, I. I. HOEPLE & J. W. SIMMONS.

AUGBR BIT DIE.

No. 412,957. Patented Oct. 15, 1889..

ATTORNEYS.

(No Model.) a Sheets-Sheet 2.

G. H. IRWIN, P. I. HOEPLE & J. W. SIMMONS.

' AUGER BIT n15.

Patented 001;. 15, 1889.

A T TOR/V5 Y 8.

(No Model.) 3 Sheets--She et 3..

C. H. IRWIN, F. I. I-IOEPLB & J. W. SIMMONS. AUGBR BIT DIE.

No. 412,957. Patented Oct. 15, 1889..

as. y- J 9. 1% y datum ATTORNEYS.

UNITED STATES PATENT OFFICE.

CHARLES H. IRWIN, FRANCIS I. I-IOEFLE, AND JAMES W. SIMMONS, OF WIL- MINGTON, OHIO, SAID HOEFLE AND SIMMONS ASSIGNORS TO SAID IRIVIN.

AUGER-BIT DIE.

SPECIFICATION forming part of Letters Patent No. 412,957, dated October 15, 1889. Application filed August 27, 1889. Serial No. 322,140. (No model.)

To aZZ whom it vita concern..-

Be it known that we, CHARLES H. IRWIN, FRANoIs I. HOEFLE, and JAMES W. SIMMONS, all of Wilmington, in the county of Clinton 5 and State of Ohio, have invented new and Improved Auger-Bit Dies, of which the following is a full, clear, and exact description.

Our invention relates to dies for forging auger-bits,-and has forits object to provide I series of dies of this character to be operated successively for forging bits having a spiral blade or flange which surrounds a central stem which has a spiral form between the convolutions of the blade and gradually merges into them. The dies also produce on the bit-stem within the last or point-approaching convolution of the main spiral blade or flange, which carries one cutter, an auxiliary semi-spiral flange, which carries the other cutter. Auger-bits made by these dies are easily finished, are very strong, and easily clear themselves of chips made by the cuttors.

The invention consists in certain novel features of construction of the auger-bit dies, all as hereinafter described and claimed.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figures 1 and 2 are faceviews of opposing dies adapted to form the spiralbody portion of an auger-bit shown in Fig. 5 of the drawings. Figs. 3 and 4: are face views of opposing dies adapted to form the cutters and gimlet-point stud of the bit-blank shown in Fig. 6 of the drawings. Figs. 7 and 8 are face views of opposing dies adapted to forge the head or point of the straight center-stem-bit blank shown in Fig. 11 of the drawings. Figs. 9 and 10 are face views of opposing dies adapted to forge the head or point of a bitblank of the same diameter as that shown in Fig. 11, but having aspiral center stem. Fig. 12 shows part of a bit-blank produced with a spiral center stein forged in the dies shown in Figs. 1 and 2 and ready for action of the dies forming the auxiliary spiral blade or flange, the cutters, and the gimlet-point stud or blank. Figs. 13 and 14 are face views of opposing dies adapted for partly forging the head of the straight center-stem-bit blank shown in Fig. 17 to give it the form shown in Fig. 18 of the drawings, and Figs. 15 and 16 are face views of opposing dies which forge the extremity of the bit-blank first struck up in the dies shown in Figs. 1 and 2 of the drawings.

The invention refers more particularly to dies for forging a bit having a spiral blade or flange which surrounds a central stem which has a spiral form between the convolutions of the blade or flange and gradually merges into them and presents lengthwise of the finished bit a laterally zigzag or wavy line to the eye however the bit may be viewed. Thedies for forging the cutting-head of such a bit also form special features of the invention.

Figs. 1 and 2 of the drawings show oppos ing dies adapted for forging the body or spi- 7o ral-bladed portion of a bit of this character.

I show these two dies each provided with but one peculiarly-formed cavity or combination of recesses, but each die may also have a primary shallower cavity or combination of recesses providing for first breaking down therein a metal rod prior to completing the bit-body forging in the opposing die cavities or recesses shown. One die A is formed with two diagonally-ranging concaved or semicir- 8o cular cavities a a, and the other die A is provided with but one such cavity a,which,when the dies are face to face, comes between the two concavities a a, of the other die. The die A, each way beyond its diagonal concavity a, is provided with a semi-spirally formed lengthwise depression b, and beyond these two depressions b the die is preferably provided with concaved depressions c c. The other die A is provided between its two diagonal concavities a a with a semi-spirally formed lengthwise depression I), and beyond or at the outer walls of the two concavities a a are formed partial spiral lengthwise depressions c c, and at one end is formed a depression cl, which corresponds in shape with one end portion of the diagonal concavities a a at the same side of the die. The depres sions c b b b are peculiarly formed. do not take a general course paralle longitudinal line 00, which would bisect the center of the die concavities or depressions in the line of the axis of a bit forged by the dies, but they range diagonally and preferably at a very quick pitch, and are made comparatively shallow at their center portions and gradually deepen and broaden toward their ends, which merge by rounding or curved lines into the sides of the diagonal concavities at a of the dies and make these concavities wider at the meeting faces of the dies than at their bases. It is obvious from Figs. 1 and 2 of the drawings that the diagonal flan e-formin concavit a of the die A 0 turned by the operator will be forged into a bit-body having substantially the form shown in Fig. 5 of the drawings and provided with the spiral or convoluted stem 6, formed mainly in or by the die-depressions 0b 1), and a spiral flange f, surrounding this stem and produced mainly in or by the die-concavities a a. It may, however,be more correct to state that the concavities and depressions of both dies co-operate to produce a bit-body having a spiral blade or flange which surrounds a central stem which has a spiral form between the convolutions of the blade or flange and gradually merges into them and presents lengthwise of the bit a Wavy line to the eye from any lateral point of View, and greatly facilitates clearance of chips from a hole bored by the finished bit. The depressions c c d provide for feeding the metal rod properly to the dies, and the two opposing depressions c d leave sufficient stock 6 at the outer end of the rod to form thereon by other dies, hereinafter referred to, the short auxiliary spirally-disposed flange f, at the extremity of which one cutter is formed, while the opposite cutter is forged at the extremity of the main spiral blade or flange f of the bit-body.

Fig. 12 of the drawings shows a portion of thebit body or blank after it has been operated on by these dies A A to form the spiral blade and center stem and leave stock 0 at the end of the rod from which to forge the short spiral flange and cutters above mentioned.

Figs. 15 and 16 of the drawings show the dies B B, by which the partly-forged bit blank or body shown in Fig. 12 is broken down at the end 6 to form on the bit-stein the short auxiliary flange f by the smaller and larger concavities or depressions b 12 formed in the dies B B, respectively, while the bit-body is held in position by the concavities a a a and depressions b b c c, which are like those bearing the same referwee-letters in the dies A A, hereinbefore de- In other words, these two dies B B form at or from the end 6 of the bit-blank shown inFig. 12 the flange f and an end stud e substantially like the flange and stud shown on the bi -blank in Fig. 18 of the drawings. This last-named bit-blank, however, has a straight center stem 6 which the spiral blade f surrounds, and on which the auxiliary flange f is forged. This end stud 6 when formed on a bit-blank having a spiral center stem 6 and forged in the dies B B will be produced mainly by the central depression 17 in one of the dies.

The two dies 0 O(shown in Figs. 9 and 10 of the drawings) are used to produce the cutters g g and gimlet-point stud 9 after the bit blank or body has been acted on by the dies B B to form the flange f and the stud e Depressions d d and d d 01 in the dies C C form the cutters .g g and gimlet-point stud g at the head of a bit having the spiral or convoluted center stem 6 above described.

Figs. 3 and 4 of the drawings show a pair of dies D D, adapted to form the cutters 9 g, and gimlet-point stud g on the end of a bit-blank of larger diameter than is shown in Figs. 5 and 12, but of the same style or with a spiral center stem 6. In this case the short auxiliary spirally-disposed flange or blade f is produced by the depression h in the die D, while the depression h in the die D produces the lower convolution of the main spiral blade f of the bit. Depressions hh in the two dies produce the cutters g g of the bit, and when a lower spur-cutter g is to be produced on the cutters, as indicated in dotted lines in Fig. 6 of the drawings, lower depressions h 7r will be produced in the dies D D next the depressions 7L3 7r, as also indicated in dotted lines. Depressions h in the two dies form the giinlet-point stud g of this bit-blank.

Figs. 13 and 14 of the drawings show opposing dies E E, adapted to break down the extremity e of the straight-stem-bit blank shown in Fig. 17 to form the short auxiliary spirally-disposed flange f around the stem and partially form the bitcutters, this spiral flange being produced by the depressions 2' z" in the dies, while the main spiral flange f is formed by the depressions 1 The straight stern e is produced by the depressions 1' and the gin1let-point-stud blank 6 is formed mainly by the depression 1' in one of the dies.

Figs. 7 and 8 of "the drawings show a pair of dies F F having depressions 7c by which are produced on the bit-blank shown in Fig. 18 the cutters g g and gimlet-point stud g shown on the bit-blank represented in Fig. 11 of the drawings. The straight center stem of this bit is formed by the depres' sions k k of these two dies, while the main spiral blade or flange fis produced by the depressions W, and the auxiliary spiral flange f is produced by the depressions 70 as will readily be understood from the aforesaid description.

It is manifest that our invention is not lim ited to the construction of the first above-described dies, by which the peculiar bit-blank body E shown in Figs. 5 and 12 of the drawings is formed, as this body is not of itself a completelyforged bit-blank; hence our in vention also includes the dies herein described for producing the auxiliary cuttercarrying flange f, the cutter-blanks g g, and gimlet-point-stud blank g and especially when these are formed on a bit-body blank E, having the convoluted center stem 6. WVe consider the herein-described series of dies operating one pair after the other are legitimately in combination to produce by their successive but joint actions completely-forged bit-blanks, lacking only the ordinary or any approved tempering and polishing operations to fit them for use as completely-finished easy-working augur-bits.

Having thus described our invention,what we claim as new, and desire to secure by Letters Patent, is-

1. In dies for forging auger-bits, the bitbody dies made with adjacent inclined spiralblade-forming concavities, and with contiguous diagonally-ranging semi-spiral centersteni-forining depressions made shallow at their center parts and gradually deeper and broader toward their ends, which merge into the spiral-blade-formin g con cavities, substantially as described, whereby the dies will produce -a bit-body having a spiral blade or flange surrounding a central stem, which itself has a spiral form between the convolutions of said blade or flange, as set forth.

2. In dies for forging auger-bits, the bitheading dies provided with concavities and depressions receiving the outer parts of the central stem of the blank and its surrounding main spiral blade or flange, and provided, also, with semi-spiral flange-forming depressions at or between the concavities and de pressions producing the last convolution of the main spiralflange of the bit, substantially as described, whereby the bit-blank will have support at its outer part in the die While an auxiliary semi-spiral flange is produced on it by the dies within the last convolution of the main spiral flange of the bit, as set forth.

3. In dies for forging auger-bits, the bitheadfor1ning dies provided with concavities and depressions receiving the outer parts of the center stem of the bit-blank and its surrounding main spiral blade or flange, and provided, also, with semispiral-flange-forining depressions at or between the concavities or depressions forming the last convolution of the main spiral flange of the bit, and provided,

also, with an extension of the center-stemforming depressions beyond those forming the main and auxiliary spiral flanges, substantially as described, whereby the bit-blank will have support at its outer part in the dies while an auxiliary semi-spiral flange and a central gimlet-point-stud blank is produced on it by the dies, as set forth.

4. In dies for forging auger-bits, the bitpoint and cutter-forming dies provided with concavities and depressions receiving the outer parts of the central stern of the blank and its surrounding main spiral blade or flange, and also receiving the auxiliary se1nispiral flange formed within the last convolution of the main spiral flange, and provided, also,with depressions producing cutting-edges at the extremities of the main and auxiliary flanges, and provided, also, with depressions forming from the projecting end of the cen ter stem the tapering giinlet-point stud of the bit, substantially as herein set forth.

5. In dies for forging augerbits, the bit body dies A A, formed with adjacent inclined spiral-blade-forming concavities a a a, contiguous diagonally-ranging semi-spiral center-ste1n-forn1ing depressions b 0 Z), which are shallow at their center parts and gradually deepen and broaden toward their ends, which merge into the spiral-blade-forining concavities and end depressions c c d, substantially as described, for the purposes set forth. 7

6. In dies for forging auger-bits, the heading-dies B B, provided with inclined spiralblade and center=-stem receiving depressions a a a b b, and provided, also, with depressions b 6 forming on a bit-blank an auxiliary cutter supporting flange Within the last convolution of the main spiral blade or flange, and provided, also, with a depression 19 forming the girnlet-pointstud blank, substantially as herein set forth.

7. In dies for forging auger-bits, the bitpointing dies 0 0, formed with concavities a a a a ,depressions b c I) 19 12 receiving the main spiral blade, the center stem, and the auxiliary flange of the bit, and provided, also,

with gimlet-poi11t-forming depressions cl d and cutter-forming depressions d d (P, substantially as herein set forth.

CHARLES H. IRWIN. FRANCIS I. HOEFLE. JAMES W. SIMMONS.

Witnesses:

JOHN E. HITCH, EDWIN TURNER. 

